package com.zzg.springboot.validate;

import org.apache.commons.lang3.StringUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.security.web.authentication.AuthenticationFailureHandler;
import org.springframework.social.connect.web.HttpSessionSessionStrategy;
import org.springframework.social.connect.web.SessionStrategy;
import org.springframework.stereotype.Component;
import org.springframework.web.bind.ServletRequestBindingException;
import org.springframework.web.bind.ServletRequestUtils;
import org.springframework.web.context.request.ServletWebRequest;
import org.springframework.web.filter.OncePerRequestFilter;

import com.zzg.springboot.controller.ValidateController;

import javax.servlet.FilterChain;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

@Component
public class ValidateCodeFilter extends OncePerRequestFilter {
	 @Autowired
	    private AuthenticationFailureHandler authenticationFailureHandler;

	    private SessionStrategy sessionStrategy = new HttpSessionSessionStrategy();

	    @Override
	    protected void doFilterInternal(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, FilterChain filterChain) throws ServletException, IOException {
	        if (StringUtils.equalsIgnoreCase("/login", httpServletRequest.getRequestURI())
	                && StringUtils.equalsIgnoreCase(httpServletRequest.getMethod(), "post")) {
	            try {
	                validateCode(new ServletWebRequest(httpServletRequest));
	            } catch (ValidateCodeException e) {
	                authenticationFailureHandler.onAuthenticationFailure(httpServletRequest, httpServletResponse, e);
	                return;
	            }
	        }
	        filterChain.doFilter(httpServletRequest, httpServletResponse);
	    }

	    private void validateCode(ServletWebRequest servletWebRequest) throws ServletRequestBindingException, ValidateCodeException {
	        ImageCode codeInSession = (ImageCode) sessionStrategy.getAttribute(servletWebRequest, ValidateController.SESSION_KEY_IMAGE_CODE);
	        String codeInRequest = ServletRequestUtils.getStringParameter(servletWebRequest.getRequest(), "imageCode");

	        if (StringUtils.isBlank(codeInRequest)) {
	            throw new ValidateCodeException("验证码不能为空！");
	        }
	        if (codeInSession == null) {
	            throw new ValidateCodeException("验证码不存在！");
	        }
	        if (codeInSession.isExpire()) {
	            sessionStrategy.removeAttribute(servletWebRequest, ValidateController.SESSION_KEY_IMAGE_CODE);
	            throw new ValidateCodeException("验证码已过期！");
	        }
	        if (!StringUtils.equalsIgnoreCase(codeInSession.getCode(), codeInRequest)) {
	            throw new ValidateCodeException("验证码不正确！");
	        }
	        sessionStrategy.removeAttribute(servletWebRequest, ValidateController.SESSION_KEY_IMAGE_CODE);

	    }
}
